Controller with a user interface



FIG. 1 is a front view of a controller with a user interface showing the claimed design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a forth image thereof; and,

FIG. 5 is a fifth image thereof.

The dotted broken lines showing portions of the user interface flat control panel, text and other elements in the Figures form no part of the claimed design. The dot-dash-dot broken lines in the Figures represent boundaries and form no part of the claimed design. The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-5. The process or period in which one image transitions to another image forms no part of the claimed design. 

CLAIM The ornamental design for a controller with a user interface, as shown and described. 